McAllister weather by month
What a typical year looks like in McAllister, Montana: average highs and lows, rain and snow, and the warmest and coldest days on record. Normals are the 1991–2020 averages at Virginia City, 23 km from McAllister; records cover 1893–2026.
The year at a glance
- Precipitation a year
- 15.7 in398 mm
- Snow a year
- 65 in164 cm
- Last spring freeze
- Jun 13
- First fall freeze
- Sep 12
- Heating degree days
- 7,858
- Cooling degree days
- 183
Freeze dates are medians (half of years earlier, half later). Degree days use a 65°F base; HVAC design temperatures here are −9°−23° (heating, 99%) and 91°33° (cooling, 1%).
Month by month
McAllister in January
Highs average 37°3° and lows 15°−9°, with 0.67 in17 mm of precipitation and 11 in28 cm of snow in a typical January.
- Record high
- 65°18° (2015)
- Record low
- −40° (1963)
- Heating degree days
- 1211
- Cooling degree days
- 0
McAllister in February
Highs average 39°4° and lows 15°−9°, with 0.59 in15 mm of precipitation and 8 in20 cm of snow in a typical February.
- Record high
- 64°18° (1958)
- Record low
- −39° (1933)
- Heating degree days
- 1060
- Cooling degree days
- 0
McAllister in March
Highs average 47°8° and lows 22°−5°, with 0.93 in24 mm of precipitation and 7 in17 cm of snow in a typical March.
- Record high
- 73°23° (2026)
- Record low
- −22°−30° (2019)
- Heating degree days
- 941
- Cooling degree days
- 0
McAllister in April
Highs average 54°12° and lows 29°−2°, with 1.8 in44 mm of precipitation and 11 in27 cm of snow in a typical April.
- Record high
- 81°27° (1910)
- Record low
- −11°−24° (1936)
- Heating degree days
- 708
- Cooling degree days
- 0
McAllister in May
Highs average 64°18° and lows 37°3°, with 2.4 in60 mm of precipitation and 4 in11 cm of snow in a typical May.
- Record high
- 91°33° (1954)
- Record low
- 12°−11° (1968)
- Heating degree days
- 454
- Cooling degree days
- 1
McAllister in June
Highs average 73°23° and lows 43°6°, with 2.7 in70 mm of precipitation and 0.2 in0.5 cm of snow in a typical June.
- Record high
- 100°38° (1919)
- Record low
- 23°−5° (1924)
- Heating degree days
- 230
- Cooling degree days
- 16
McAllister in July
Highs average 83°28° and lows 50°10°, with 1.3 in34 mm of precipitation in a typical July.
- Record high
- 103°39° (1919)
- Record low
- 27°−3° (1955)
- Heating degree days
- 54
- Cooling degree days
- 91
McAllister in August
Highs average 81°27° and lows 49°9°, with 1.1 in29 mm of precipitation in a typical August.
- Record high
- 98°37° (1919)
- Record low
- 24°−4° (1976)
- Heating degree days
- 69
- Cooling degree days
- 67
McAllister in September
Highs average 71°22° and lows 41°5°, with 1.2 in30 mm of precipitation and 0.2 in0.5 cm of snow in a typical September.
- Record high
- 99°37° (2022)
- Record low
- 8°−13° (1926)
- Heating degree days
- 269
- Cooling degree days
- 8
McAllister in OctoberThis month
Highs average 58°14° and lows 31°0°, with 1.4 in34 mm of precipitation and 4 in9 cm of snow in a typical October.
- Record high
- 85°29° (2010)
- Record low
- −10°−23° (1971)
- Heating degree days
- 636
- Cooling degree days
- 0
McAllister in November
Highs average 44°7° and lows 21°−6°, with 0.82 in21 mm of precipitation and 8 in20 cm of snow in a typical November.
- Record high
- 74°23° (2020)
- Record low
- −25°−32° (1955)
- Heating degree days
- 974
- Cooling degree days
- 0
McAllister in December
Highs average 35°2° and lows 14°−10°, with 0.77 in20 mm of precipitation and 12 in31 cm of snow in a typical December.
- Record high
- 63°17° (2020)
- Record low
- −38°−39° (1983)
- Heating degree days
- 1252
- Cooling degree days
- 0